This is a single, translucent, dark blue, benitoite crystal with fine luster. It has large gemmy areas. Given the weight, its a certainty that you could cut stones from this and make a buck (probably worth $1500-2000 cut up) but I prefer to leave it as an unusually fine loose gem crystal! It has EXCEPTIONAL lustre and rich blue color!
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:: Locality: San Benito County, California, USA ([http://www.mindat.org/loc-3279.html Locality at mindat